Abstract
Switched-capacitor fractional-step filter design of low-pass filter prototypes with Butterworth characteristics is reported in this work for the first time. This is achieved using discrete-time integrators which implement both the bilinear and the Al-Alaoui s-to-z transformations. Filters of orders 1.2, 1.5 and 1.8 as well as 3.2, 3.5, and 3.8 are designed and verified using transistor-level simulations with Cadence on AMS \(0.35\,\upmu \)m CMOS process. Digital programmability of the fractional-step filters is also achieved.
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This work was supported by Grant E.029 from the Research Committee of the University of Patras (Programme K. Karatheodori).
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Psychalinos, C., Tsirimokou, G. & Elwakil, A.S. Switched-Capacitor Fractional-Step Butterworth Filter Design. Circuits Syst Signal Process 35, 1377–1393 (2016). https://doi.org/10.1007/s00034-015-0110-9
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DOI: https://doi.org/10.1007/s00034-015-0110-9